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Unread 09-19-2016, 05:34 PM   #1
big_rat
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Bathroom Remodel

Hello all,

I am remodeling my bathroom. I demo'd all of the tile which was set on mortar beds. After removing the tiles I noticed that there is some water damage (see attached pictures). A couple of studs have some water damage, you can see stains on part of the drywall that is a part of the finished room next to the bathroom and there is some damage on a small area of subfloor. Would it be possible for me to clean everything up with a product like Concrobium or do I need to go further than that? I have removed the curb already. Thanks!
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Unread 09-19-2016, 06:11 PM   #2
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I think those subfloor planks definitely need to be replaced. The studs don't look too bad, you can probably sister new studs next to them.
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Unread 09-19-2016, 06:25 PM   #3
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I was planning to install 1/2" BC plywood on top. Do you think I still need to replace the planks?

What about the drywall? Is that black stuff on the plank/stud/drywall mold or is it just how it looks from water? I don't mean the stuff around the shower drain, that looks to be tar or something from the tar paper. I just mean the black stuff from the water damaged parts.
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Unread 09-19-2016, 07:46 PM   #4
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There is mold on that lower right hand corner of that drywall. I would cut out, starting a couple inches above the mold, that piece of drywall stud to stud in the room next to the bathroom. I see a piece of the sole plate that has some mold and I would probably cut that section out. You probably don't need to replace all the planks but I would definitely replace the parts that a really water damaged. You can buy new pieces of 1x4 pine or get a piece of 3/4 bc plywood and cut it to fit spanning three joists. Then you can go back and screw all the planks down to the joists with 2 1/2" deck screws. Then you can put your 1/2" BC plywood on top of the subfloor with 1 1/4" deck screws. The wood for the curb doesn't look great either. That should be easy enough to replace.
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Unread 09-19-2016, 08:05 PM   #5
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The plank that the shower drain goes through has a cut through it. Do I need to replace that plank as well? I would like to avoid cutting into the plank with the black glue or whatever that is on them.

Also is there a way to replace the drywall without removing the baseboard trim in the other room?

You said cut the planks spanning 3 joists. Most of the damage is less than a foot long, can't I just replace those couple of planks spanning between two joists?
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Unread 09-19-2016, 08:22 PM   #6
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I would replace whatever planks are damaged. You can replace planks spanning just two joists but I think it's a better repair to span three joists. You probably don't need to remove the baseboard to replace the drywall, you just have to be more creative on getting all the damaged Sheetrock out. Let's see if one of the pros can also give you some insight.
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Unread 09-25-2016, 06:11 PM   #7
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I removed the affected planks. I bought new T&G planks to install. Do I need to have any spacing between each plank or do I just jam them together and screw them down? The old planks have some spacing between them but I'm not sure if it was intentional or just spread apart over time.
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Unread 09-25-2016, 06:25 PM   #8
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The old ones were originally jammed together and shrunk over time.
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Unread 09-25-2016, 07:09 PM   #9
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There is no need to have 1/8" gap like tongue & groove plywood?
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Unread 09-25-2016, 07:15 PM   #10
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Depends on the moisture content of the new ones. Are they 14% or less ?
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Unread 09-25-2016, 07:29 PM   #11
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Good question. I forgot I had a moisture meter lol.

The new planks are 7-8%. The old planks are about 10.5%.
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Unread 09-25-2016, 08:01 PM   #12
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I'd leave a little gap just to be safe. They could always expand a bit.
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Unread 09-26-2016, 12:23 AM   #13
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I have another question. Underneath where the toilet goes in this bathroom has some boxed 2x8 framing. Its about 41"x47" in this boxed 2x8' area. The subfloor is screwed onto 2x4s which are laid out flat and themselves are nailed into the boxed 2x8s. The mud bed tile installation lasted over 40 years with no cracks or issues. However, this seems strange to me. The rest of the floor is 2x8's with about 11' between supports.

Is this a normal practice with 2nd floor bathrooms to make space for plumbing?
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Unread 09-26-2016, 12:36 AM   #14
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John I've seen some boxes made like that for plumbing, but not that large of a box. Usually they're no more than 2'x2' or so.

I'm not sure I'm following you on the orientation of the 2x4's, and if they're spanning the entire box opening or something else.

Could you possibly post a picture of the area you're describing?
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Unread 09-26-2016, 12:51 AM   #15
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Pics kind of impossible unless I rip out a bunch of more subfloor. Essentially subfloor in this 41"x47" section is screwed into 2x4s on their backs and the 2x4s are nailed into the joists. I think there are only 2 of these 2x4's in this section.

I don't understand how the floor feels so rigid and how the previous tile installation had no issues. Seems counter intuitive to me.
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